12.2 The data in Table EX 12.2 records the patient falls in three care units over a seventeen-week period. a. For each unit, calculate LCL and UCL for an appropriate control chart, using 95.5 percent confidence limits. b. Construct a control chart for each unit. c. Are any observations in violation of the control limits for the unit?

Patient Falls	Unit I	Unit II	Unit III
Week 1	2	1	3
Week 2	1	2	1
Week 3	2	3	0
Week 4	2	2	2
Week 5	3	1	2
Week 6	1	0	1
Week 7	2	2	2
Week 8	1	0	1
Week 9	0	1	4
Week 10	1	1	3
Week 11	2	2	1
Week 12	1	0	2
Week 13	0	1	1
Week 14	2	2	2
Week 15	2	1	0
Week 16	1	0	2
Week 17	2	1	3